See changes at https://scikit-learn.org/0.21/whats_new/v0.21.html
Fixes some packaging issues in version 0.21.0 along with a few bugs.
0.21.0
Not secure
A new release of Scikit-learn with many new features, enhancements and bug fixes. See https://scikit-learn.org/0.21/whats_new/v0.21.html
0.20.4
Not secure
Builds on top of Scikit-learn 0.20.3 to fix regressions and other issues released in version 0.20. See change log at https://scikit-learn.org/0.20/whats_new/v0.20.html
0.20.3
Not secure
A bug-fix release in the 0.20 series, supporting Python 2 and 3
0.20.2
Not secure
Bug-fix release to the 0.20 branch, supporting Python 2 and 3